http://arxiv.org/abs/1807.01208
The angular differential imaging (ADI) is used to improve contrast in high resolution astronomical imaging. An example is the direct imaging of exoplanet in camera fed by Extreme Adaptive Optics. The subtraction of the main dazzling object to observe the faint companion was improved using Principal Component Analysis (PCA). It factorizes the positive astronomical frames into positive and negative components. On the contrary, the Nonnegative Matrix Factorization (NMF) uses only positive components, mimicking the actual composition of the long exposure images.
C. Arcidiacono and V. Simoncini
Wed, 4 Jul 18
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Comments: 9 pages, 7 Figures, Proceeding of the SPIE Conference Adaptive Optics Systems VI, SPIE Astronomical Telescopes + Instrumentation, Austin Convention Center Austin, Texas, United States 10 – 15 June 2018
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